Tripplehorn, who was last seen on Fox's "New Girl," will be a profiler and join "Criminal Minds" in the Season 8 premiere. Brewster left the CBS series at the end of Season 7 after previously exiting the show during Season 6.

"Criminal Minds" returns this fall on CBS.

In other casting news ...
Rob Lowe and Scott Bakula are going "Behind the Candelabra." Lowe and Bakula have joined the cast of HBO's film about Liberace starring Matt Damon and Michael Douglas. [THR]
Peter Reckwell is leaving "Days of Our Lives." No word on when the soap actor will make his final appearance. [TVLine]
Brent Spiner is coming to "Warehouse 13." The "Star Trek: The Next Generation" actor will appear in at least six episodes as Brother Adrian, the leader of a secret sect. [TV Guide]